JP6010349B2 - Dyeing method and dyeing apparatus - Google Patents

Description

  The present invention relates to a method for dyeing a transparent resin, particularly a plastic lens, using laser light, and a dyeing apparatus used in the method.

  Conventionally, as a method for dyeing a transparent resin such as a plastic lens, a method for dyeing a lens by immersing the lens in a dyeing solution for a predetermined time (a dyeing method) is known. Although this method has been used conventionally, there have been problems in that the working environment is not good and it is difficult to dye a lens having a high refractive index. Therefore, the present applicant uses an ink jet printer to apply (output) dyeing ink containing a sublimation dye onto a substrate such as paper and place it in a vacuum in a non-contact manner with the lens. A dyeing method using a method of dyeing by skipping to the side (hereinafter referred to as a gas phase transfer dyeing method) has been proposed (see, for example, Patent Document 1). In this method, the dye is fixed on the lens surface by heating the entire lens in an oven.

  In addition, in such a gas phase transfer dyeing method, the lens may turn yellow if the heating temperature required for fixing is high. To solve such a problem, the lens surface is used with laser light. A method of fixing the dye by partially heating was proposed (see Patent Document 2).

JP 2001-215306 A JP 2009-244515 A

  However, it has been found that the laser dyeing method described in Patent Document 2 is likely to cause a new problem that color unevenness is likely to occur although yellowing can be suppressed as much as high temperature is not applied to the entire lens.

  In view of the above-described problems of the prior art, it is an object of the present invention to provide a dyeing method and dyeing apparatus using laser light that can suitably dye a transparent resin such as a plastic lens while suppressing occurrence of color unevenness. .

  In order to solve the above problems, the present invention is characterized by having the following configuration.

(1) In a dyeing method for fixing a dye on the transparent resin body by heating the transparent resin body on which the dye is applied, a laser beam is directed toward the transparent resin body on which the dye is applied on the surface. Irradiating and scanning the laser light relative to the transparent resin body to heat the area to be dyed of the transparent resin body to fix the heating, the heating process comprising the laser light Heating while changing the laser light irradiation conditions for the heating location on the transparent resin body so that the heating temperature on the transparent resin body by the irradiation of is substantially the same heating temperature over the entire region to be dyed It is characterized by that.
(2) In the staining method according to (1), the heating step detects a heating temperature on the transparent resin body irradiated with the laser beam, and changes the laser beam irradiation condition based on the detection result. It is characterized by.
(3) In the dyeing method according to (1), the heating step irradiates the first region of the transparent resin body having a large thickness in the region to be dyed with a first laser light irradiation condition. In the second region, which is a relatively thin region with respect to the thickness of the first region, the laser beam is irradiated under a second laser beam irradiation condition different from the first laser beam irradiation condition. Heating is performed.
(4) Laser light irradiation for irradiating the transparent resin body with laser light in a dyeing apparatus for fixing the dye to the transparent resin body by heating the transparent resin body coated with the dye on the surface Means, scanning means for scanning the laser light irradiated by the laser light irradiation means relative to the transparent resin body, and relative to the staining region of the transparent resin body by the scanning means While the scanning of the laser beam is being performed, the heating temperature on the transparent resin body due to the irradiation of the laser light is substantially the same over the entire region to be dyed. And a control means for controlling to irradiate the laser beam by changing the laser beam irradiation condition for the heated portion.
(5) The staining apparatus according to (4) further includes detection means for detecting a heating temperature on the transparent resin body irradiated with the laser beam, and the control means detects the heating temperature by the detection means. Based on the above, the laser light irradiation condition is changed.
(6) in the dyeing device (4), before Symbol control means, and changing the laser irradiation conditions in accordance with a change in thickness of the transparent resin body.

  According to this invention, transparent resin bodies, such as a plastic lens, can be dye | stained suitably.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a schematic diagram of a staining system used in a staining method using laser light of the present invention, and FIG. 2 is a diagram showing a schematic configuration of a staining apparatus.

  The dyeing system includes a dyeing substrate producing apparatus 100 for producing a dyeing substrate, and a plastic lens 10 which is a dyed material applied to the dyeing substrate (in this embodiment, a plastic lens is used as a transparent resin). ) Comprises a vacuum gas phase transfer machine 20 for depositing (transferring) the sublimable dye, and a dyeing device 30 for irradiating the plastic lens 10 on which the sublimable dye is deposited with laser light.

The dyeing substrate forming apparatus 100 includes a monitor 101, a personal computer (hereinafter abbreviated as PC) 102, an ink jet printer 103, and the like. Reference numeral 104 denotes an operation unit for operating a PC such as a keyboard and a mouse. The PC 102 is used to execute the dyeing substrate creation program stored in the hard disk and output the dyeing substrate 1 from the ink jet printer 103. The hard disk of the PC 102 has various substrate information for the plastic lens and dyeing for application to the substrate, in addition to the dyeing substrate creation software program for creating the staining substrate for dyeing the plastic lens. Ink color data and the like are stored.

  The dyeing substrate 1 is obtained by applying (outputting) dyeing ink in a predetermined shape to a medium such as paper that can be used in the ink jet printer 103. In addition, in order to increase the heat absorption efficiency of the dyeing substrate 1, a material in which the entire back surface (surface on which printing is not performed) is black is used.

  In addition, the dyeing ink used in the inkjet printer 103 uses at least three colors of red, blue, and yellow. The dye contained in the dyeing ink needs to use a dye that has sublimability and can withstand the heat during sublimation. Furthermore, after the dye is deposited on the plastic lens, it is necessary that the dyeing is performed on the plastic lens in a state where there is no unevenness when the coloring is performed and the dye is fixed on the plastic lens. Considering these points, a quinophthalone sublimation dye or an anthraquinone sublimation dye is preferably used as the dye.

  The vacuum gas layer transfer machine 20 shown in FIG. 1 is provided with an opening / closing door (not shown) for taking in and out the plastic lens 10 and the dyeing substrate 1 described above. A heating lamp 21 as a heat source for heating the dyeing substrate 1 and sublimating the dye is installed in the upper part of the vacuum gas phase transfer machine 20. Although the halogen lamp is used for the heating lamp 21 used in the present embodiment, it is not limited to this as long as it can be heated without contact with the dyeing substrate 1. A dyeing jig 200 is placed on the floor of the vacuum gas phase transfer machine 20, and the plastic lens 10 and the dyeing substrate 1 are attached to the dyeing jig 200. Reference numeral 22 denotes a rotary pump, which is used for making the inside of the vacuum gas phase transfer machine 20 almost vacuum. Reference numeral 23 denotes a leak valve. By opening this valve, outside air is introduced into the vacuum gas-phase transfer machine 20 which has been almost evacuated, and returned to atmospheric pressure. The dyeing jig 200 holds the lens 10 (surface to be dyed) and the dyeing substrate 1 (ink application surface) so as to face each other in a non-contact manner.

  The plastic lens 10 used is made of polycarbonate resin (for example, diethylene glycol bisallyl carbonate polymer (CR-39)), polyurethane resin, allyl resin (for example, allyl diglycol carbonate and its copolymer). , Diallyl phthalate and copolymers thereof), fumaric acid resins (for example, benzyl fumarate copolymer), styrene resins, polymethyl acrylate resins, fiber resins (for example, cellulose propionate), and thio A material having a high refractive index such as urethane or thioepoxy, or a material having a high refractive index that has been conventionally inferior in dyeability can be used. Further, it is also possible to use a lens in which a predetermined coating such as a hard coat is applied to the dyed surface side of such a plastic lens. When the lens is coated, the dye may be attached to the lens surface by depositing (applying) the dye on the coating layer.

  Further, the dyeing device 30 is used for fixing and coloring the dye by irradiating the plastic lens 10 with the sublimable dye with a laser beam and heating it at a predetermined temperature in the vacuum gas phase transfer machine 20.

FIG. 2 is a schematic view showing the configuration of the staining apparatus 30.
The staining apparatus 30 includes an apparatus main body 31 that emits laser light and a moving stage 32. The apparatus main body 31 includes a laser light source 33 that emits laser light having a predetermined wavelength, a reflection mirror 36, a lens 37, a moving stage 32, a drive mechanism 38, a control unit 39, a control unit 40, a storage unit 41, and the like.

The laser light source 33 emits laser light having a wavelength in the infrared region. In this embodiment, a light source that emits CO2 laser light having a wavelength of 10.2 to 10.8 μm is used. However, the present invention is not limited to this, and red that can be absorbed by the substrate of a transparent resin body (here, a plastic lens). Any laser beam can be used as long as it emits laser light having a wavelength in the outer region or in the ultraviolet region (including near ultraviolet). It is also possible to heat the substrate by placing an infrared absorber or ultraviolet absorber on the lens in addition to the dye (coating or vapor deposition) and absorbing the laser light in the absorber. In the case of using an absorbent, it is preferable that the dye and the absorbent are laminated in this order on the base material. The laser light emitted from the laser light source 33 is bent by the reflection mirror 36 and then passes through the lens 37. And condensed. In this embodiment, a laser beam having a diameter of about 3.8 mm is emitted from the laser light source. In this embodiment, after passing through the lens 37, the surface of the plastic lens 10 is defocused so as to have a diameter of about 10 mm to 35 mm. The diameter of the laser beam on the plastic lens by defocusing is not limited to this, and may be determined as appropriate in consideration of productivity and irradiation energy. For example, the spot diameter of the laser beam on a plastic lens is preferably about 5 mm to 50 mm, more preferably about 10 mm to 40 mm. Further, it is also possible to form a laser beam in a line shape using a cylindrical lens or the like.

  A moving stage 32 is installed at the irradiation destination of the laser beam to be defocused so as to be movable up and down, front and rear, left and right (horizontal direction and vertical direction). The moving stage 32 is moved by the drive of the driving mechanism 38, and the moving amount and moving direction are always detected by a detecting means (not shown). Drive control of the drive mechanism 38 is performed by the control unit 39, and the control information (movement direction and movement speed) is set by a control unit (condition setting unit) 40 in which switches (not shown) are prepared. On the moving stage 32, the mounting table 11 is fixedly placed, and the plastic lens 10 on which the sublimation dye is deposited is placed with the deposition surface (scheduled staining surface) facing upward. The mounting table 11 is fixedly placed on the moving stage 32, and the positional relationship with respect to the moving stage 32 is known in advance. Therefore, even when the moving stage 32 is driven in a state where the plastic lens is placed on the mounting table 11, the control unit 39 can always detect the irradiation position of the laser light on the plastic lens. The control unit 40 can also set the output of laser light, the moving speed of the moving stage, and the like. In addition, the storage unit 41 includes setting information including identification information of various plastic lenses and laser irradiation conditions (for example, output conditions and scanning speed conditions based on the scanning position) necessary for suitably dyeing the various plastic lenses. Are stored in advance in association with lens identification information. When the plastic lens 10 is dyed using the dyeing device 30, the type (identification information) of the plastic lens to be dyed is selected using the control unit 40. The control unit 39 calls the setting information (laser beam irradiation condition) corresponding to the selected identification information from the storage unit 41, and controls the laser light source 33 and the drive mechanism 38 based on the called setting information.

  As a result of intensive studies, the present inventors have found that when the thickness (thickness) of the lens peripheral region and the thickness near the center of a plastic lens, such as a plus lens and a minus lens, differ, It has been found that color unevenness is likely to occur when laser light irradiation is performed under a certain output condition on the entire region (scheduled dyeing surface) of the plastic lens on which the dye is deposited without consideration. Such a phenomenon is considered that heat diffusion by the laser beam is difficult to be performed in a thin portion, and the dye is sublimated again, so that it is difficult to fix on the lens surface. Therefore, the output condition of the laser beam that is below the temperature at which the dye sublimates is ensured while ensuring the fixing temperature necessary for the dye deposited on the lens to be physically or chemically bonded to the lens material. Required across the entire surface. For this purpose, the irradiation condition of the laser beam to the heating spot on the plastic lens is appropriately changed so that the heating temperature of the lens surface by the irradiation of the laser beam becomes substantially the same heating temperature (surface temperature) in the entire region to be dyed. There is a need.

For this reason, in the present invention, for various plastic lenses whose thickness varies between the periphery and the center, for example, the color unevenness is suppressed by changing the laser light output condition according to the region. . More specifically, when trying to dye the entire area to be dyed with the same color for a plastic lens whose thickness varies greatly from the periphery toward the center, an area located within a predetermined area from the center (Center area) and the area outside the center area (
At least one of the scanning speed of the laser beam and the irradiation output of the laser beam depending on whether the region irradiated with the laser beam is the central region or the peripheral region. The output condition of the laser beam is changed so as to change. For example, when the thickness of the central region is smaller than the thickness of the peripheral region, the scanning speed of the laser light in the central region is made faster than the scanning speed of the laser light in the peripheral region, or the laser light in the peripheral region The output value of the laser beam in the central region is made lower than the output value. The central region may be circular or other shape (for example, rectangular shape). In the present embodiment, a predetermined range (for example, 30 mm × 30 mm) is defined as the central region (rectangular shape) with the lens center as the region center.

  When the laser light irradiation conditions are changed in such different areas, the degree of change is such that the color density difference (or transmittance difference) within a predetermined range of the plastic lens is preferably within about 10%. In addition, the laser beam irradiation conditions in each region may be obtained. As a range for comparing the color densities, for example, a radius within 30 mm from the lens center can be set as the comparison range. If the color density difference is within about 10%, it is difficult to discriminate color unevenness visually, and a practical problem is unlikely to occur. Such laser light irradiation conditions can be obtained experimentally for a predetermined type of plastic lens, for example. In addition, as a form to change the irradiation condition of the laser beam at the heating location on the plastic lens, the laser beam output is constant and the laser beam is directed toward the plastic lens, other than adjusting the laser beam output by controlling the laser light source. It is also possible to insert / remove at least one type of filter for attenuating light appropriately on the optical path of the laser beam.

  In the present embodiment, the laser lens irradiation condition is applied to each of the two areas of the plastic lens to be dyed. However, the present invention is not limited to this. A plurality of regions may be set according to the above, and different laser light irradiation conditions may be determined for each region so that the color density difference in all the stained regions is within about 10%. In addition, it is also possible to change the laser light irradiation conditions continuously (including linear and non-linear) according to the change in thickness, instead of stepwise region setting (condition setting).

  In the present invention, the sublimation dye is not heated by the laser beam, but the laser beam is irradiated to the substrate to heat the surface of the substrate (plastic lens) so as not to melt, and the molecular structure of the polymer is loosened. As a state in which the dye is likely to permeate, the sublimable dye is taken into the substrate and fixed and colored by the affinity of the sublimable dye to the substrate. Therefore, the output of the laser beam is a unit at the surface to be dyed by the laser beam so that the temperature at which the plastic lens does not melt and the temperature necessary to loosen the molecular structure of the polymer constituting the substrate. The irradiation energy density around the area is determined. Such adjustment of the irradiation energy density can be performed not only by adjusting the output of the laser light emitted from the laser light source 33 by the control unit 40 but also by the scanning speed or defocusing of the laser light with respect to the plastic lens. Further, when scanning is performed with the laser beam line focused or defocused on the lens surface, scanning is performed once with an irradiation energy that does not cause sublimation of the dye by heating, and fixing of the dye by one scanning ( When complete fixing) cannot be performed, the scanning line is repeatedly overlapped, and scanning is performed so that the scanning line is gradually shifted, so that irradiation energy necessary for fixing the dye can be given to the lens side.

  Further, in this embodiment, the laser beam is scanned with respect to the surface to be dyed by moving the lens side without scanning the laser beam. However, the present invention is not limited to this, and a laser including a galvanometer mirror or the like is used. What is necessary is just to be able to scan a laser beam relatively with respect to a lens, such as scanning a laser beam with respect to a plastic lens using an optical scanning means.

  Hereinafter, the operation of the dyeing method for the plastic lens 10 will be described. The plastic lens used here is a meniscus lens having a minus power, and the thickness near the center is thinner than the thickness around the lens.

As shown in FIG. 2, the plastic lens 10 is placed on the mounting table 11 with the surface on which the sublimation dye is applied facing upward, with the sublimation dye applied uniformly on the surface thereof. next,
The sublimation dye application surface of the plastic lens 10 is irradiated with CO2 laser light. Since the power of the CO2 laser beam is too strong, the laser beam is once condensed through the lens 37 and then defocused on the surface of the plastic lens. Thereby, the irradiated spot light has a spread and the light density is weakened. Further, by using a detection means (not shown), the movement position of the moving stage 32 (mounting table 11) by the driving mechanism 38 is always grasped by the control unit 39, and has a known size placed on the mounting table 11. The irradiation position of the laser beam on the plastic lens can be detected.

  FIG. 3 shows a laser beam scanning method. The plastic lens 10 has a diameter of about 100 mm, and the thickness (thickness) is 2 mm at a thin portion near the center and 8 mm at a thick portion around the lens, and is different in each part. A sublimation dye is applied to the surface of the plastic lens 10. In the present embodiment, a peripheral region having a large thickness is defined as a first region 10a, and a central region having a relatively small thickness is defined as a second region 10b. Here, a rectangular area of 30 mm × 30 mm is defined as the second area 10b with the lens center as the center of the center area.

  By moving the moving stage in the XY (front / rear / left / right) direction, as shown in FIG. 3, the first scan, the folded second scan, and the folded third scan are performed. Since the first scan and the second scan are moved 2 mm laterally (downward on the paper surface), for example, if the spot diameter of the laser beam is 10 mm, the first scan and the second scan have an overlap of 8 mm. It will be given. The same applies to the following scans. Each scan covers the entire area of the plastic lens 10.

  The control unit 39 drives the moving stage 38 so that a predetermined scanning speed is obtained when the laser beam is scanning the range of the first region 10a on the plastic lens 10 (for example, the first scan and the second scan). I have control. On the other hand, when the first area 10a and the second area 10b appear on the scan line as in the third scan, the control unit 39 performs the second area 10b at a speed higher than the scan speed on the first area 10a. The moving stage 38 is driven and controlled to scan the top.

  The laser light source 33 is a CO2 laser and has a wavelength of 10.2 to 10.8 [mu] m. This wavelength is infrared light, and the sublimable dye hardly absorbs light of this wavelength. In the present embodiment, a material having a high refractive index such as thiourethane or thioepoxy is used as the material of the plastic lens 10. The material of the plastic lens 10 used in the present embodiment absorbs about 50 to 90% of the wavelength of 10.2 to 10.8 μm.

  Since the CO2 laser light is not easily absorbed by the dye and is absorbed by the plastic lens 10, only the surface of the plastic lens 10 is heated to loosen the molecular structure of the polymer of the resin and loosen the molecular structure of the polymer. The disperse dye can be fixed on the surface of the plastic lens 10 by diffusing the sublimable disperse dye in the portion. Further, by performing control to change the scanning speed in the regions having different thicknesses, the fixing of the dye can be maintained at the same level on the entire surface to be dyed, and the occurrence of color unevenness can be suppressed.

  The transparent resin body is a plastic lens having a high refractive index of 1.60 or more. In the conventional dyeing method by oven heating, it is difficult to dye plastic lenses made of, for example, thiourethane or thioepoxy resin having a refractive index of 1.60 or more, and it must be heated at 140 ° C. or more for 2 hours or more. However, it was not possible to stain at a sufficient concentration. However, in consideration of workability, dyeing in a short time is necessary, and it is possible to dye in a short time by setting the temperature to 150 ° C. or higher. However, the entire lens turns yellow, Deformation will occur. In this embodiment, as a method of placing (applying) the dye on the lens surface, a method of heating the sublimable dye in vacuum and depositing the dye on the lens is used, but the present invention is not limited to this. For example, a sublimable dye may be sublimated in the atmospheric pressure and deposited on the lens surface, or the dye may be applied to the lens surface by a spin coat method or the like.

  In the above-described embodiment, the laser light irradiation conditions (for example, laser light output and relative scanning speed) are changed depending on the thickness of the lens at the laser light irradiation position. Absent. It is only necessary that the laser light irradiation conditions can be appropriately changed so that the laser light is irradiated so that the heating temperature on the lens by the laser light becomes substantially the same heating temperature in the entire region to be dyed. In the present embodiment, substantially the same heating temperature includes variations in heating temperature at which color unevenness cannot be visually confirmed when dyeing with a uniform color density is intended. More specifically, it includes variations in heating temperature such that the color density difference (or transmittance difference) within a predetermined range on the planned dyeing surface of the plastic lens is preferably within about 10%. Other embodiments will be described below.

  4 and 5 are schematic views of a staining apparatus used in the second embodiment. In addition, the detailed description is abbreviate | omitted as a structural member which has the same code | symbol as the dyeing apparatus shown in FIG. 2 as the dyeing apparatus of embodiment mentioned above. 4, in the staining apparatus 30 shown in FIG. 2, a non-contact thermometer 50 serving as a detection means for detecting (measuring) the heating temperature (lens surface temperature) of the irradiation position of the laser beam on the lens 10 in a non-contact manner. Is newly provided. As the non-contact thermometer, for example, a radiation thermometer that measures the temperature of an object by measuring the intensity of infrared or visible light from the object can be suitably used. As shown in the figure, the non-contact thermometer 50 is installed so that the irradiation position (heating location) of the laser beam on the lens 10 can be detected from obliquely above. More preferably, the non-contact thermometer is installed so that the measurement axis (dotted line) of the non-contact thermometer 50 and the optical axis of the laser beam intersect at a predetermined angle, and the lens 10 is positioned such that the intersection is on the lens 10. The height position of is set.

  The non-contact thermometer 50 is connected to the control unit 39, and the detection result of the heating temperature by the non-contact thermometer 50 is transmitted to the control unit 39. Based on the received detection result of the heating temperature, the control unit 39 appropriately changes the laser irradiation condition so that the preset heating temperature can be maintained within a predetermined range, and outputs the laser light emitted from the laser light source 33. To control. The target heating temperature is set in advance using the control unit 40. The setting of the heating temperature is set to a heating temperature at which the dye can be fixed to the lens 10 in consideration of the material of the transparent resin body (lens here) that is the object to be dyed. Although the heating temperature depends on the resin material, the heating temperature is set to a temperature necessary for fixing the dye and a temperature at which the dye does not easily sublimate. Such heating temperature is preferably in the range of 100 ° C. to 200 ° C., more preferably 110 ° C. to 170 ° C. Depending on the set heating temperature, there is a possibility that a part of the dye attached to the lens 10 may sublime. However, since substantially the same heating temperature can be maintained over the entire dyed surface of the lens, the dye sublimation. Is the same regardless of the irradiation position of the lens, and the occurrence of color unevenness is suppressed.

  In addition, the control unit 39 drives the moving stage 38 so that a time necessary for fixing the dye to the lens 10 is sufficiently given by the heating temperature set at the laser irradiation position of the lens 10. The relative scanning speed of the laser beam by the moving stage 32 may be fixed regardless of the set heating temperature, or may be set in association with the set heating temperature. A plurality of pieces of laser irradiation condition information for setting different heating temperatures and scanning speeds according to various resin materials are stored in the storage unit 41 in advance, and the lens type (resin material and lens shape) is stored in the control unit 40. The corresponding laser irradiation conditions (for example, heating temperature and scanning speed) can be called from the storage unit 41 and set.

  In the present embodiment, the output of the laser light emitted from the laser light source is adjusted so that the set heating temperature can be maintained within a predetermined range, but the present invention is not limited to this. For example, by changing the other laser irradiation conditions, such as changing the defocused state of the laser light on the lens 10 using an optical member, or irradiating the laser light in a pulsed manner, the output of the laser light is constant. It is also possible to maintain the set heating temperature. Further, when the temperature detection is performed and the laser light irradiation condition is appropriately adjusted, the relative scanning direction of the laser light with respect to the lens may always be performed from a certain direction. By always performing the scanning direction from the same direction, even if the laser light irradiation position on the lens is deviated from the temperature detection position, the temperature detection condition is made the same as the relative laser light scanning by the reciprocating motion. It is possible to detect the heating temperature more stably. Furthermore, when the heating temperature of the non-contact thermometer is detected obliquely with respect to the irradiation position of the laser beam, the angle of the measurement optical axis of the non-contact thermometer with respect to the measurement position of the lens is the irradiation angle of the optical axis of the laser beam. It is preferable to be made to approach.

  FIG. 5 is a schematic diagram showing an example in which the measurement axis of the non-contact thermometer 50 is coaxial with the optical axis of the laser beam in the staining apparatus shown in FIG. Detailed description of components having the same reference numerals as those in the staining apparatus shown in FIG. 2 is omitted as components having the same functions as the staining apparatus of the above-described embodiment.

  On the optical path of the laser light emitted from the laser light source 33, a mirror 51 is provided to make the measurement axis of the non-contact thermometer 50 coaxial with the optical axis of the laser light. The installation position of the mirror 51 is not limited as long as it can be coaxial with the optical axis of the laser beam. However, in order to suppress damage to the mirror, the mirror 51 is installed at a position deviating from the laser beam condensing position. preferable. In this embodiment, it is installed on the optical path between the condensing position of the laser beam by the lens 37 and the lens 10. As the mirror 51, a dichroic mirror having a characteristic of transmitting the wavelength of laser light and reflecting other wavelengths, a half mirror, a laser mirror that highly reflects a specific wavelength, or the like can be used. In particular, in the present embodiment, a dichroic mirror that transmits a wavelength of 10.2 to 10.8 μm that is the wavelength of the laser light used and reflects a wavelength (for example, 5 μm) of a measurement band of a non-contact thermometer is used. It is supposed to be.

  The laser light emitted from the laser light source 33 is condensed by the lens 37, then passes through the mirror 51, and is irradiated to the lens 10 in a defocused state. When a part of the lens 10 is heated by the irradiated laser light, infrared rays are generated. The non-contact thermometer 50 measures the intensity of infrared light having a specific wavelength at the laser light irradiation position generated in the lens 10 through the mirror 51 and detects the heating temperature. The control unit 39 sequentially adjusts the output of the laser beam by controlling the laser light source 33 so that the heating temperature preset by the control 40 and the detected heating temperature are approximately the same. Such a dyeing apparatus in which the optical axis of the laser beam and the measurement axis of the non-contact thermometer are coaxial can measure the heating temperature of the surface of a resin body having a curved surface like the lens 10 more accurately. .

  When reflected light (scattered light) of laser light is incident on a non-contact thermometer and affects the detection result, a filter that cuts the wavelength of the laser light and transmits other wavelengths is used for the non-contact thermometer. It can also be installed in the front.

  In the above-described embodiment, the plastic lens is described as an example of the object to be dyed as the transparent resin body. However, the present invention is not limited to this, and is a plate-like transparent resin body or other shape transparent resin body. Needless to say, the present invention can also be applied.

Next, specific examples will be described.
<Example 1>
1. Test conditions (1) Dye application to plastic lens surface Vapor phase transfer method (1-1) Used equipment printer EPSON PX-6250S
INK NIDEK TTS INK RED NK-1
Made by NIDEK TTS INK YELLOW NK-1
Made by NIDEK TTS INK BLUE NK-1
Printing software NIDEK TTS-PS1.0
Vapor phase transfer device TTM-1000
(1-2) Printing was performed with the data (blue) in Table 1 using PX-6250S on a printing transfer paper.

各インクの最大印刷量が１０２４、半分の印刷量が５１２としている。
（１−３）気相転写
印刷した転写紙とＭＲ８レンズ（Ｓ−２．５０）を治具にセットし、ＴＴＭ−１０００に入れて転写作業を行った。この時の条件は、真空度０．５ｋＰａ、転写紙の温度は２２５℃。ＭＲ８レンズの屈折率は、１．６０である。
（１−４）レーザ照射テスト
実験器具 レーザコヒーレント社製 GEM-100A
レーザ光の出力 ６５Ｗ
ＤＰを出たレーザ光の直径３．８ｍｍ
レーザ集光レンズ（ｆ＝37.5ｍｍ）からプラスチックレンズまでの距離を３９０ｍｍとし、デフォーカスさせることにより、プラスチックレンズ上で直径３５ｍｍのスポット径
周辺領域のスキャン速度 ３３．４ｍｍ／ｓ
中心領域のスキャン速度 ６６．８ｍｍ／ｓ レンズ中心30ｍｍ×30ｍｍの範囲の速度
実験方法 染料を塗布したレンズをステージにセットして、周辺領域と中心領域とでスキャン速度を変えた制御を行いながらレーザ光照射させる。スキャン速度はレーザ光軸が周辺領域にあるか中心領域にあるかにより変更を行う。
２．テスト結果
色の着色、基材表面のダメージ、透過率（色ムラ）について評価した。
（１）色の着色：レーザ光照射完了した後、アセトンを浸した布で拭きあげて、着色できているか確認した。色落ちも無く所望する濃度にて染色されていた。
（２）基材表面のダメージ：表面の反射を見て、照射した部分のダメージ（基材溶融による凸凹）がないか確認した。各色に染色されたレンズ表面を確認したが、何れもダメージはなかった。
（３）透過率：レンズ中心を基準として経線方向に±１０ｍｍ，±２０ｍｍ，±３０ｍｍの各位置を測定ポイントとして透過率を測定した。測定器は朝日分光（株）MODEL304を使用した。透過率の結果を表２に示す。透過率は各測定点で異なるものの、その差は１０％
以内であり、目視による色ムラは判別できなかった。
＜比較例１＞
レンズの領域に関係なく一定のスキャン速度（３３．４ｍｍ／ｓ）としたこと以外は、全て実施例１と同じ条件である。
（１）色の着色：レーザ光照射完了した後、アセトンを浸した布で拭きあげて、着色できているか確認した。色落ちも無く所望する濃度にて染色されていた。
（２）基材表面のダメージ：表面の反射を見て、照射した部分のダメージ（基材溶融による凸凹）がないか確認した。各色に染色されたレンズ表面を確認したが、何れもダメージはなかった。
（３）透過率：実施例１同様に透過率の測定を行った。その結果を表２に示す。透過率は各測定点で異なるものの、その差は１０％を越え、目視によって色ムラを確認することができた。

The maximum print amount of each ink is 1024, and the half print amount is 512.
(1-3) Vapor-phase transfer-printed transfer paper and MR8 lens (S-2.50) were set on a jig and transferred to TTM-1000 for transfer work. At this time, the degree of vacuum was 0.5 kPa, and the temperature of the transfer paper was 225 ° C. The refractive index of the MR8 lens is 1.60.
(1-4) Laser irradiation test experimental equipment GEM-100A manufactured by Laser Coherent
Laser light output 65W
Diameter of laser beam exiting DP is 3.8mm
The distance from the laser condenser lens (f = 37.5 mm) to the plastic lens is set to 390 mm, and defocusing is performed, so that the scanning speed of the peripheral area of the spot diameter of 35 mm on the plastic lens is 33.4 mm / s.
Center area scan speed 66.8mm / s Lens center 30mm x 30mm speed experiment method Set the dye-coated lens on the stage, and control the laser while changing the scan speed between the peripheral area and the central area. Light is irradiated. The scan speed is changed depending on whether the laser optical axis is in the peripheral region or the central region.
2. Test results The coloration, substrate surface damage, and transmittance (color unevenness) were evaluated.
(1) Coloring: After completion of the laser beam irradiation, it was wiped off with a cloth soaked with acetone to check whether it was colored. There was no color fading and dyed at the desired density.
(2) Damage on the surface of the base material: It was confirmed whether or not there was any damage (irregularity due to base material melting) in the irradiated portion by looking at the reflection on the surface. The surface of the lens dyed in each color was confirmed, but none was damaged.
(3) Transmittance: Transmittance was measured at each position of ± 10 mm, ± 20 mm, and ± 30 mm in the meridian direction with respect to the center of the lens as measurement points. Asahi Spectroscope MODEL304 was used as a measuring instrument. The transmittance results are shown in Table 2. The transmittance is different at each measurement point, but the difference is 10%
The color unevenness by visual inspection could not be determined.
<Comparative Example 1>
All the conditions are the same as in Example 1 except that the scanning speed is constant (33.4 mm / s) regardless of the lens area.
(1) Coloring: After completion of the laser beam irradiation, it was wiped off with a cloth soaked with acetone to check whether it was colored. There was no color fading and dyed at the desired density.
(2) Damage on the surface of the base material: It was confirmed whether or not there was any damage (irregularity due to base material melting) in the irradiated portion by looking at the reflection on the surface. The surface of the lens dyed in each color was confirmed, but none was damaged.
(3) Transmittance: The transmittance was measured in the same manner as in Example 1. The results are shown in Table 2. Although the transmittance was different at each measurement point, the difference exceeded 10%, and color unevenness could be confirmed visually.

It is the figure which showed schematic structure of the dyeing | staining system in this embodiment. It is the block diagram which showed schematic structure of the dyeing | staining apparatus used for this embodiment. It is the schematic diagram which showed the relative scanning of the laser beam with respect to a lens. It is the figure which showed schematic structure of the dyeing | staining apparatus used for other embodiment. It is the figure which showed schematic structure of the dyeing | staining apparatus used for other embodiment.

DESCRIPTION OF SYMBOLS 1 Substrate for dyeing | staining 10 Plastic lens 20 Vacuum vapor phase transfer machine 30 Dyeing apparatus 32 Moving stage 33 Laser beam source 36 Reflection mirror 38 Drive mechanism 39 Control part 40 Control part 41 Storage part

Claims (6)

In the dyeing method of fixing the dye to the transparent resin body by heating the transparent resin body coated with the dye on the surface,
Laser light is irradiated toward the transparent resin body coated with a dye on the surface, and the dyeing region of the transparent resin body is heated by scanning the laser light relative to the transparent resin body. A heating step for performing the fixing, wherein the heating step is performed on the transparent resin body so that the heating temperature on the transparent resin body by the irradiation of the laser light is substantially the same in the entire region to be dyed. The dyeing | staining method characterized by including the process of heating, changing the laser beam irradiation conditions with respect to a heating location.   The dyeing method according to claim 1, wherein the heating step detects a heating temperature on the transparent resin body irradiated with the laser beam, and changes the laser beam irradiation condition based on the detection result. Staining method. The staining method according to claim 1, wherein
In the heating step, the first region of the transparent resin body having a large thickness in the region to be dyed is irradiated under the first laser light irradiation condition and is relatively thin with respect to the thickness of the first region. A staining method, wherein heating is performed by irradiating the laser beam under a second laser beam irradiation condition different from the first laser beam irradiation condition in a second region that is a thick region. In the dyeing apparatus for fixing the dye to the transparent resin body by heating the transparent resin body coated with the dye on the surface,
Laser light irradiation means for irradiating the transparent resin body with laser light; and scanning means for scanning the laser light irradiated by the laser light irradiation means relative to the transparent resin body; The heating temperature on the transparent resin body due to the irradiation of the laser light is changed to the dyeing-scheduled area while the laser beam is scanned relative to the dyeing-scheduled area of the transparent resin body. Control means for controlling to irradiate the laser beam by changing the laser beam irradiation condition for the heating spot on the transparent resin body so that the heating temperature is substantially the same in the entire region of Dyeing equipment to do.   The staining apparatus according to claim 4 further includes detection means for detecting a heating temperature on the transparent resin body irradiated with the laser light, and the control means is based on detection of the heating temperature by the detection means. A dyeing apparatus characterized by changing laser light irradiation conditions. The staining apparatus according to claim 4, wherein
Before SL control means, dyeing apparatus characterized by changing the laser irradiation conditions in accordance with a change in thickness of the transparent resin body.

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